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Resonant inductive power transfer for an E-bike charging station

机译：电动自行车充电站的共振感应功率传输

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This paper presents the design and the experimental tests of an E-bike 300-W battery charger for a cyclo-station based on wireless power technology. In particular, a series resonant inductive power converter with an E-geometry magnetic core topology is proposed. A mathematical model is developed and a performance analysis is conducted to determine the voltage transfer function, maximum power transfer capability, efficiency for different air-gaps (1-3 cm), and misalignments (0.5-1.5 cm). Also, it is performed analytical and experimental investigations of the minimum and maximum relative frequency points of active input power and efficiency in order to determine how these points changed as the resistance load varied. The results of the analyses indicated that the maximum frequency points of active input power are different from the maximum frequency points of efficiency and the zero-frequency points of reactive input power. This means that maximum power transfer and efficiency conversion are not obtained in correspondence with the resonant frequency. For this purpose, it is conducted a wide frequency characterization of 30-50 kHz around the designed resonant frequency of 40 kHz. An iterative electrical and magnetic design procedure is proposed based on 3D finite element analysis. Simulation and experimental results are presented for a full-sized prototype. The design of the E-bike battery charger is validated in terms of rated input voltage and output power for different air-gap configurations. (C) 2016 Elsevier B.V. All rights reserved.
机译：本文介绍了一种基于无线功率技术的用于循环站的电动自行车300W电池充电器的设计和实验测试。特别地，提出了具有E几何磁芯拓扑的串联谐振感应功率转换器。建立了数学模型并进行了性能分析，以确定电压传递函数，最大功率传递能力，不同气隙的效率（1-3厘米）和未对准（0.5-1.5厘米）。另外，它还对有功输入功率和效率的最小和最大相对频率点进行了分析和实验研究，以确定这些点随电阻负载的变化如何变化。分析结果表明，有功输入功率的最大频率点与效率的最大频率点和无功输入功率的零频率点不同。这意味着无法获得与谐振频率相对应的最大功率传输和效率转换。为此，在40 kHz的设计谐振频率附近进行了30-50 kHz的宽频率表征。提出了一种基于3D有限元分析的迭代电磁设计程序。给出了一个完整原型的仿真和实验结果。电动自行车电池充电器的设计已根据不同气隙配置的额定输入电压和输出功率进行了验证。 （C）2016 Elsevier B.V.保留所有权利。

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